Amazon's Prime Instant Video is currently a part of the Amazon Prime program, which provides members with unlimited two-day shipping and other benefits for $79 per year.

In September, Amazon inked a video deal with Fox; previously, the company signed deals with CBS, NBC, Sony, Warner Bros. and others.

The addition of Viacom to that list is another sign that Prime Instant Video might soon become a full-fledged competitor to Netflix and other streaming video companies. Google and Verizon are also expected to launch an online video streaming service in 2012, which should make for a very interesting year.

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